Njangal Santhushtaranu

Njangal Santhushtaranu is a 1999 Malayalam film, made in India, starring Jayaram.

Young Geethu causes misery to Sajeevs sisters, like a stepmother. Once she plays a cruel trick by saying that Sajeev had died. His family is in pain, and when Sajeev returns home, everybody is shocked. Sajeev slaps Geethu for her deed. She goes back to her home, in anger. Geethus family reveals to her that she is an adopted child, and so she should not feel proud of her legacy. She runs away to an orphanage. Her family visits her and gives her good advice. Geethu returns to her husbands home and starts a new life afresh.

Source: Wikipedia